James - misread your initial post. Try looking at this one:
http://www.montie.com/#rfid -- it's designed to test if RFID antennas /
sensors are correctly working. I am not sure if this device would be a
decent countermeasure for detecting RFID detectors but it's relatively
inexpensive to try out.

-Joel


"The path to hell is paved with good intentions."


On Wed, Aug 19, 2009 at 12:26 PM, Vincent Lape <[email protected]> wrote:

> I think he is looking forsomething more along the lines of a "radar
> detector" for RFID readers.
>
>
>
> On Aug 19, 2009, at 8:09 AM, John Navarro <[email protected]> wrote:
>
>
> <http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/517/Default.aspx>
> http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/517/Default.aspx
> <http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/517/Default.aspx>small
> enough?
>
> On Tue, Aug 18, 2009 at 2:56 PM, James Costello < <[email protected]>
> [email protected]> wrote:
>
>> Does anyone know of a device that could be used to alert when there are
>> RFID sensor around?  Something small, about the size of key fob.
>> Something that might be good to have at say a computer security
>> conference.
>>
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